At the end of the Mexican War that would ahve been the kindest thing we could have done.
A border wall stretching from Tampico to Tepic would only be about 750 miles.
What do you really think though shock. If we brought in Mexico as a state rather than connecting with them as an equal in this rediculous North American Union, would it be more palatable?
What if we did it in phases over time?
Imagine only having a 300 mile border than an 1800 mile border to guard.